To prevent clogs during closed transfer I've sometimes removed the keg post and stretched silicone tubing over the keg port as if it were a hose barb. This works well, but silicone is famously very permeable to oxygen. Of course, cold crashing, care with racking arm angle, and filtering also reduce clog risk, but those keg poppets can still clog. Any suggestions for low-permeability tubing for this application?